Speaker
Description
I will discuss recent progress in applying a general theoretical framework to the study of three-body resonances in lattice QCD. As a concrete example, I will focus on the doubly-charmed tetraquark $T_{cc}^+$(3875) emerging as a state in elastic $DD\pi$ scattering amplitude. After a short overview of the tetraqaurk physics and the finite- and infinite-volume field-theory formalism, I will describe results of the first three-body lattice QCD computation* of this state at pion mass $m_\pi \approx 280$ MeV. Our approach incorporates both $DD^*$ and $DD\pi$ dynamics, including one-pion exchanges, and marks an important next step toward determining the properties of near-threshold three-body resonances directly from QCD.
*–perhaps still ongoing at the time of the conference.
